Piston cooling apparatus



FIG. 1 is a front-left perspective view of a piston cooling apparatusaccording to the claimed design.

FIG. 2 is a front view of the piston cooling apparatus.

FIG. 3 is a rear view of the piston cooling apparatus.

FIG. 4 is a right side view of the piston cooling apparatus.

FIG. 5 is a left side view of the piston cooling apparatus.

FIG. 6 is a top view of the piston cooling apparatus; and,

FIG. 7 is a bottom view of the piston cooling apparatus.

The broken lines in FIGS. 1-7 illustrate portions of the piston coolingapparatus that form no part of the claimed design.

CLAIM The ornamental design for a piston cooling apparatus, as shown anddescribed.